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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Amortized Cost | $ 72,873 | $ 59,031
Gross Unrealized Gains | 260 | 5
Gross Unrealized Losses | (1,363) | (2,480)
Aggregate Estimated Fair Value | 71,770 | 56,556
Funds Held For Clients, Restricted Cash and Debt Securities | 75,201 | 59,385
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses | (1,379) | (2,480)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains | 260 | 5
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost | $ 76,320 | $ 61,860
Number of securities in unrealized gain position | security | 54 | 3
Number of securities in unrealized loss position | security | 113 | 124
Funds Held For Clients, Restricted Cash, Amortized Cost | $ 3,447 | $ 2,829
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses | (16) | 0
Funds Held For Clients, Restricted Cash | 3,431 | 2,829
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains | 0 | 0
Individually |  |
Funds Held for Clients |  |
Gross Unrealized Losses | (61) | (96)
Certificates of deposit |  |
Funds Held for Clients |  |
Amortized Cost | 845 | 983
Gross Unrealized Gains | 2 | 4
Gross Unrealized Losses | (1) | (2)
Aggregate Estimated Fair Value | 846 | 985
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 67,277 | 52,251
Gross Unrealized Gains | 258 | 1
Gross Unrealized Losses | (1,090) | (2,023)
Aggregate Estimated Fair Value | 66,445 | 50,229
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 4,251 | 5,297
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (239) | (405)
Aggregate Estimated Fair Value | 4,012 | 4,892
U.S. Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (33) | (50)
Aggregate Estimated Fair Value | $ 467 | $ 450

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